Index: libcfa/src/concurrency/channel.hfa
===================================================================
--- libcfa/src/concurrency/channel.hfa	(revision 0aef54988a056cb7811cb355c108a70531e7f89a)
+++ libcfa/src/concurrency/channel.hfa	(revision 251ce804bfa9c794ec6fdf5d077a6553e6d749a4)
@@ -50,4 +50,7 @@
 };
 vtable(channel_closed) channel_closed_vt;
+
+static inline bool is_insert( channel_closed & e ) { return elem != 0p; }
+static inline bool is_remove( channel_closed & e ) { return elem == 0p; }
 
 // #define CHAN_STATS // define this to get channel stats printed in dtor